A dog suffering from small amounts of blood in the stool indicates that the condition has worsened and requires immediate treatment. Parvovirus is mainly spread through feces, urine, vomitus, saliva, etc. Dogs with parvovirus have been detoxifying through feces and urine, and even recovered dogs will detoxify for a long time. The early symptoms of parvovirus are mainly depression, loss of appetite, vomiting, soft stools, diarrhea, etc. Once the above symptoms are found in dogs, immediate treatment is required to increase the chance of cure.